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Gathering the idea for a long lens better than my DA55-300. I'd appreciate any thought or experiences between options, here are my thoughts:
Assumption: going over 300mm generally represents a significant bump in price. Therefore, my thoughts are at 300mm and under.
Pentax DA*60-250: Everyone seems happy with the quality of this lens. It's not quite as long as other options that hit 300mm. It's weather sealed, though; I've shot airshows and kids on the beach, so weather sealing is definitely a plus.
Sigma 100-300 f/4: The examples I've seen from this lens are great, and it gains an extra 50mm on the DA*60-250. However, it's not weather sealed, and I'm guessing it's a bigger and heavier lens.
Pentax DA*300: I like the flexibility of zooms, especially when shooting action and the kids. Is the DA*300 that much of a better lens to sacrifice the flexibility of the DA*60-250? When I shoot wildlife, I typically want to go as long as I can, but I'm not so sure I could make this rule on other events or the kids - another argument for the flexibility of a zoom.
Opinions and comparisons on the three lenses are much appreciated. What did I miss? What other lenses might I want to consider taking the above considerations into account?